EP 4024057 B1 20230823 - RESIDUAL CURRENT DETECTION METHOD BASED ON MAGNETIC CORE WORKING STATE SWITCHING
Title (en)
RESIDUAL CURRENT DETECTION METHOD BASED ON MAGNETIC CORE WORKING STATE SWITCHING
Title (de)
FEHLERSTROMDETEKTIONSVERFAHREN BASIEREND AUF MAGNETISCHER KERNARBEITSZUSTANDSSCHALTUNG
Title (fr)
PROCÉDÉ DE DÉTECTION DE COURANT RÉSIDUEL BASÉ SUR UNE COMMUTATION D'ÉTAT DE TRAVAIL DE NOYAU MAGNÉTIQUE
Publication
Application
Priority
- CN 201910955505 A 20191009
- CN 2020119323 W 20200930
Abstract (en)
[origin: EP4024057A1] A residual current detection method based on magnetic core working state switching. Since a direct-current leakage signal does not fluctuate and a coil cannot sense the signal, the signal needs to be superimposed onto an alternating signal. Therefore, an H-bridge circuit outputs, by using a chip, two states of positive and negative square waves in order to realize an external magnetic field. A bidirectional saturation excitation square wave signal enters a bidirectional saturation region of a magnetic core, and direct-current leakage detection and protection are completed by using different characteristics produced by direct currents in different regions of a magnetization curve and by means of algorithm extraction and discrimination. The alternating-current leakage fluctuates, and works in a linear region of a magnetic core, such that a coil can directly sense a signal, including 50 Hz and high-frequency alternating-currents, for example, 400 Hz, 1 kHz, 20 kHz and 150 kHz, and in this case, the coil does not have an excitation signal, and alternating-current leakage detection and protection are also completed by means of performing an algorithm extraction calculation on data; and complex residual current detection is completed by means of switching between the three states of positive excitation, reverse excitation and non-excitation.
IPC 8 full level
G01R 19/25 (2006.01); G01R 15/18 (2006.01); G01R 31/00 (2006.01); G01R 31/52 (2020.01)
CPC (source: CN EP US)
G01R 15/183 (2013.01 - CN EP US); G01R 19/25 (2013.01 - CN); G01R 31/52 (2020.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 4024057 A1 20220706; EP 4024057 A4 20221109; EP 4024057 B1 20230823; EP 4024057 C0 20230823; CA 3153829 A1 20210415; CA 3153829 C 20231010; CN 110609171 A 20191224; CN 110609171 B 20220607; US 2022373579 A1 20221124; WO 2021068832 A1 20210415
DOCDB simple family (application)
EP 20875191 A 20200930; CA 3153829 A 20200930; CN 201910955505 A 20191009; CN 2020119323 W 20200930; US 202017767455 A 20200930